The golden cross is a technical indicator that occurs when a stock's 50-day moving average crosses above its 200-day moving average. This is generally considered a bullish signal, as it may indicate a change in the long-term trend. In the case of Marvell Tech, the formation of a golden cross could lead to an increase in the stock price in the short term. However, it is important for investors to consider other factors, such as price levels and company fundamentals, before making any decisions.